Play & Charge Kit, and probably just into the 300 euros worth of Live Gold subscriptions by now, as I think I started just over 5 years ago.
And was it worth it for you?
I think for the folks who love online gaming, the yearly cost is pretty low. For the cost of one latte a month, you get to play games with people worldwide.
For the folks (like me) who don't often play online (I've played online twice since I got my console, spades, and possibly a game of settlers), we can get all the value we need, without the added cost. I do keep my gold account current, but that's because I don't like waiting a week for the demos
The 360 is a very fair console. You pay for what you use. If you don't need wireless, why pay for it. If you don't need online multiplayer, don't pay for it. Compared to the PS3, where you get what you get, and you pay up front, whether you'll use it or not.
I ran cable down to my TV, since I needed to network the HD DVD player, the Tivo, and the XBox, so I've never needed to spring for the wireless adaptor. Of course, if you don't want to pay for the MS adaptor, you can get a wireless bridge (Or wireless gaming adaptor) pretty cheaply (in the $50 range) and it has the advantage of having multiple jacks.
I have 4 wireless controllers, 6 rechargeable batteries, and I keep two batteries always charged in the charger. Whenever a controller starts complaining, I switch out batteries. No need to hook it up to anything. No wires, no mess. No need to throw away the controller when the battery stops working.